I have the same issue as well. And my game is+400mb. It still works on windows. But downloading doesn't work on Anroid/iOS/Switch even though I have space.+
Additionally realm server seems to crash if i try to upload a 400mb+ backup of the game. This really sucks...
I have the same issue. I believe it's possibility related to the fact that the world is grown more than 400MB.
I can no longer upload. It fails after the upload and the server crashes. After some time it runs again.
This is extremely annoying... We pay for realms, it's kinda unacceptable to not have core features od the realm not working.